Drosophila body plan development

Question 1

What activates segmentation genes?

Answer 1

Pair-rule genes

Question 2

In how many transverse stripes are segmentation genes expressed?

Answer 2

14 (one for each parasegment)

Question 3

T/F: engrailed is a segmentation gene

Answer 3

True

Question 4

T/F: blastoderm remains syncytial during pair-rule expression

Answer 4

False (cellularization happens)

Question 5

What is a selector gene?

Answer 5

A gene that confers an identity on a region or regions

Question 6

T/F: engrailed expression is temporary

Answer 6

False (permanent)

Question 7

In how many lines of cells is engrailed expressed, and where in the parasegment?

Answer 7

One line of cells in the anterior margin

Question 8

Pair-rule genes that affect engrailed expression

Answer 8

fushi tarazu, even-skipped

Question 9

Property of anterior and posterior boundaries of parasegments

Answer 9

Boundaries of cell-lineage restriction

Question 10

Role of segmentation genes

Answer 10

Fix positions of parasegment boundaries

Fix positions of segment boundaries of larval epidermis

Question 11

Domains of cell-lineage restriction

Answer 11

Compartments

Question 12

Group of 16 cells in the germarium

Answer 12

Germline cyst

Question 13

Components of germline cyst

Answer 13

1 oocyte + 15 nurse cells

Question 14

Cells that envelope germline cyst

Answer 14

Follicle cells

Question 15

First sign of anterior-posterior polarity of egg

Answer 15

Migration of oocyte and nurse cells from center to posterior end

Question 16

End with localized translation of Gurken protein

Answer 16

Posterior end

Question 17

Gurken effect on follicle cells

Answer 17

Induces terminal follicle cells to adopt a posterior fate

Question 18

Gurken receptor protein

Answer 18

Torpedo

Question 19

Orientation of microtubules in oocyte after Gurken signaling

Answer 19

Minus ends directed toward interior and plus ends toward exterior

Question 20

Proteins responsible for oocyte cytoskeleton reorganization

Answer 20

PAR proteins

Question 21

How is bicoid transported to anterior end?

Answer 21

Microtubules

Question 22

Maternal-effect mRNA transported to oocyte posterior

Answer 22

Oskar

Question 23

RNA binding protein needed for localization of oskar and bicoid

Answer 23

Staufen